So you wonder how good this box is? copy and paste this link for a little peak on how much air this box moves https://www.youtube.com/watch?v=mrYSLGAPxGE This box says tuned to 25hrz but has a pretty wide tone range, Ive gotten lows as far as 17hrz and highs as high as 48hrz, the box slams around 34hrz.

Very well made box moving a lot of air in a full size sedan car in the trunk.